List field calculations

The plugin List Field Number Format for Gravity Forms breaks my form. Is there another alternative for making entries in the list field numbers, _and _ perform calculations in one of those fields?

Can you provide a link to the plugin you are using which breaks the site?

And also a link to the page on your site where we can see the form. In the form, let us know where you need numbers and what calculations you need to perform. Thank you.